How much improvement will I see?

It's a 74 Duster,
360 Magnum
Refreshed Stock short block
CNC ported Speedmaster LA heads w. 2.02,1.60
Advertised Intake Duration - 274
Advertised Exhaust Duration- 282
Intake Duration @ .050 - 224
Exhaust Duration @ .050 - 230
Intake Valve Lift - .538
Exhaust Valve Lift - .534
Lobe Separation - 110
Edelbrock Torker 2-340 single plane intake
Quickfuel 750 DP
Cheap headers and 2.5" dual exhaust to bumper with H pipe
MSD 6AL
Stock distributor with FBO limiter plate
25 initial, 35 total
A500 overdrive automatic
Was Stock low stall converter, now will be 3500ish stall
8-3/4 SG, 4.30 gear (all new, sg works good)
Super stock springs and 50-50 shocks in rear
/6 torsion bars and Stock wore out shocks in front.
No sway bars
275-60-15 Nitto Drag radials on 15x8 steel wheels
Running 91octane pump gas cause that's as good as it gets here.
Weighed 3400 lbs but I added interior from a Chrysler 300S and a 12" sub since then, so I'm guessing 3500 lbs or so.

Not sure what else to say

Cley